Cutting Experiments Using a Rotating Water Jet in a Borehole

Details

• Personal Author:
  Frank JN ; Lohn PD ; Ricketts TE ; Savanick, George A.
• Description:
  An experimental hydraulic jetting device intended to operate in a 16- in-diam borehole was designed, fabricated, and used to cut coal and simulated coal samples. This device consisted of two 0.107-In-diam nozzles that rotated in a plane perpendicular to a 50-inch length of high-pressure tubing. Experiments were also conducted with stationary jets issuing from a single 0.142-In-diam nozzle. Numerous experiments were performed using systematic variations of jet parameters coupled with assessments of cutting rates. These Bureau of Mines tests showed that when operated at 4,000 psi pressure and a 40-gpm flow rate (1) the device can fragment coal up to a distance of 8 feet from the nozzle, (2) 4,000-psi jets cut more effectively than lower pressure jets with the same nozzle diameter, (3) stationary jets do not cut as effectively as moving jets, (4) interkerf breaking occurs when the kerf spacing is less than 2 inches, and (5) if the kerfs are spaced < 1/2 inch, the jet is deflected and thereby reduces cutting effectiveness. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Conference Publications ; Case Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TCRC - Twin Cities Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-34
• NIOSHTIC Number:
  nn:10001568
• NTIS Accession Number:
  PB-250781
• Citation:
  NTIS: PB 250 781; :1-34
• Federal Fiscal Year:
  1975
• Peer Reviewed:
  False
• Source Full Name:
  NTIS: PB 250 781
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9f4fc8802dbb22480ea04d903672687a7fd90d0b213533cf0dd5e2b179ca9203719ba2a53e14fe673de96fb43189af41e2df5e44bbe1a8233478fd79b3236496
• Download URL:
  https://stacks.cdc.gov/view/cdc/237665/cdc_237665_DS1.pdf
• File Type:
  [PDF - 3.50 MB ]